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  <title>Description of has</title>
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<div><a href="../../index.html">Home</a> &gt;  <a href="../index.html">matgraph</a> &gt; <a href="index.html">@graph</a> &gt; has.m</div>

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<h1>has
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
<div class="box"><strong>has --- check if the graph has a particular vertex or edge</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
<div class="box"><strong>function yn = has(g,u,v) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
<div class="fragment"><pre class="comment"> has --- check if the graph has a particular vertex or edge
 has(g,u) --- check if g contains the vertex u
 has(g,u,v) --- check if g contains the edge uv</pre></div>

<!-- crossreference -->
<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../../matlabicon.gif)">
<li><a href="nv.html" class="code" title="function n = nv(g)">nv</a>	nv(g) --- number of vertices in g</li></ul>
This function is called by:
<ul style="list-style-image:url(../../matlabicon.gif)">
<li><a href="bridges.html" class="code" title="function blist = bridges(g,algo)">bridges</a>	bridges(g,algo) --- find all cut edges in g</li><li><a href="cartesian.html" class="code" title="function cartesian(g,h1,h2)">cartesian</a>	cartesian(g,h1,h2) --- overwrite g with the product of h1 and h2</li><li><a href="hamiltonian_cycle.html" class="code" title="function [hlist, exists] = hamiltonian_cycle(g,h)">hamiltonian_cycle</a>	hamiltonian_cycle(g) --- find a Hamiltonian cycle in g (if one exists)</li><li><a href="springxy.html" class="code" title="function e=springxy(g)">springxy</a>	springxy(g) --- find a spring embedding of g</li></ul>
<!-- crossreference -->


<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function yn = has(g,u,v)</a>
0002 <span class="comment">% has --- check if the graph has a particular vertex or edge</span>
0003 <span class="comment">% has(g,u) --- check if g contains the vertex u</span>
0004 <span class="comment">% has(g,u,v) --- check if g contains the edge uv</span>
0005 
0006 <span class="keyword">global</span> GRAPH_MAGIC;
0007 n = <a href="nv.html" class="code" title="function n = nv(g)">nv</a>(g);
0008 
0009 <span class="keyword">if</span> (nargin==2)
0010     yn = (u&gt;0) &amp; (u&lt;=n);
0011 <span class="keyword">else</span>
0012     <span class="keyword">if</span> (u&lt;0) || (u&gt;n) || (v&lt;0) || (v&gt;n) || (u==v)
0013         yn = 0;
0014     <span class="keyword">else</span>
0015         yn = GRAPH_MAGIC.graphs{g.idx}.array(u,v);
0016     <span class="keyword">end</span>
0017 <span class="keyword">end</span></pre></div>
<hr><address>Generated on Fri 30-Apr-2010 07:51:16 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/">m2html</a></strong> &copy; 2003</address>
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